NXP Semiconductors LPC1311 User Manual

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User manual Rev. 3 — 14 June 2011 159 of 368
NXP Semiconductors
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Chapter 10: LPC13xx USB device controller
10.11.9 Get Error Code (Command: 0xFF, Data: read 1 byte)
Different error conditions can arise inside the SIE. The Get Error Code command returns
the last error code that occurred. The 4 least significant bits form the error code.
10.11.10 Select Endpoint (Command: 0x00 - 0x09 Data: read 1 byte (optional))
The Select Endpoint command initializes an internal pointer to the start of the selected
buffer in EP_RAM. Optionally, this command can be followed by a data read, which
returns some additional information on the packet(s) in the endpoint buffer(s). The
command code of the Select Endpoint command is equal to the physical endpoint
number. In the case of a single buffered endpoint the B_2_FULL bit is not valid.
Table 182. Get Error Code command description
Bit Symbol Value Description Reset
value
3:0 EC Error Code. 0x0
0000 No Error.
0001 PID Encoding Error.
0010 Unknown PID.
0011 Unexpected Packet - any packet sequence violation from the
specification.
0100 Error in Token CRC.
0101 Error in Data CRC.
0110 Time Out Error.
0111 Babble.
1000 Error in End of Packet.
1001 Sent/Received NAK.
1010 Sent Stall.
1011 Buffer Overrun Error.
1100 Sent Empty Packet (ISO Endpoints only).
1101 Bitstuff Error.
1110 Error in Sync.
1111 Wrong Toggle Bit in Data PID, ignored data.
4 EA - The Error Active bit will be reset once this register is read.
7:5 - Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
NA
Table 183. Select Endpoint command description
Bit Symbol Value Description Reset
value
0 FE Full/Empty. This bit indicates the full or empty status of the
endpoint buffer(s). For IN endpoints, the FE bit gives the
ANDed result of the B_1_FULL and B_2_FULL bits. For OUT
endpoints, the FE bit gives ORed result of the B_1_FULL and
B_2_FULL bits. For single buffered endpoints, this bit simply
reflects the status of B_1_FULL.
0
0 For an IN endpoint, at least one write endpoint buffer is empty.
1 For an OUT endpoint, at least one endpoint read buffer is full.

NXP Semiconductors LPC1311 Specifications

General

Brand	NXP Semiconductors
Model	LPC1311
Category	Controller
Language	English